Different Approaches of Employing Cholesteric Liquid Crystals in Dye Lasers

Chilaya, G. S.; Chanishvili, Andro; Petriashvili, Gia; Barberi, Riccardo Cristoforo; Santo, Maria Penelope De; Matranga, Mario Ariosto

doi:10.4236/msa.2011.22016

Cited by 19 publications

(16 citation statements)

References 57 publications

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“…These ways were cholesterics as distributed feedback medium and cholesterics as resonator mirrors [53]. In the dye doped distributed feedback cholesteric liquid crystal lasers, frequency tuning was achieved by exploiting light induced effects or by using a specially designed cell assembling a chiral dopant concentration gradient in combination with a suitable distribution of different dyes.…”

Section: Lasing In Dye Doped Cholesteric Liquid Crystalmentioning

confidence: 99%

Lasing Characteristics of Dye-Doped Cholesteric Liquid Crystal

Porov¹,

Chandel²,

Manohar³

2015

Transactions on Electrical and Electronic Materials

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Cholesteric liquid crystals naturally form helical structures with the helical pitch in an optical wavelength range [7]. The dye and cholesteric liquid crystal molecules are together subjected to the electric field action, which produces a collective movement that leads to changes in molecular arrangement, notably the applied electric field direction. As a result of the applied field, the helical molecular arrangement axis is perpendicular to the electric field direction and then produces an increase in the helical structure pitch [8,9].A cholesteric liquid crystal can be considered as a one-dimensional photonic crystal with a refractive index that is regularly modulated along the helix axis because of the particular arrangement of the molecules. The result is that the propagation of light is suppressed for a particular range of wavelength [10]. Preeti Porov† and Vishal Singh Chandel Department of Physics, Integral University, Lucknow 226026, IndiaReceived January 8, 2015; Revised April 9, 2015; Accepted May 3, 2015Cholesteric liquid crystals are one dimensional photonic band-gap materials due to their birefringence and periodic structure. Dye doped cholesteric liquid crystals are self-assembling, mirror-less, low threshold laser structures that exhibit distributed feedback. In this review paper, we have presented the development in the field of lasing characteristics of dye doped cholesteric liquid crystals.

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Section: Lasing In Dye Doped Cholesteric Liquid Crystalmentioning

confidence: 99%

Lasing Characteristics of Dye-Doped Cholesteric Liquid Crystal

Porov¹,

Chandel²,

Manohar³

2015

Transactions on Electrical and Electronic Materials

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“…In Fig. 2, a cholesteric pitch gradient is combined with the distribution of different dyes to provide lasing from 300 to 700 nm as shown by (Chilaya et al 2011;Chanishvili et al 2005). These optically active lasers could be embedded in a suitable packaging for covert or even forensic anti-counterfeiting solutions.…”

Section: Simple Liquid Crystals Solutionsmentioning

confidence: 97%

Anti-counterfeiting and identification solutions using soft matter

Santo

Petriashvili²,

Gary³

et al. 2015

Rend. Fis. Acc. Lincei

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Advanced countries need simple, effective and affordable novel technical solutions for anti-counterfeiting, authentication, identification and traceability of goods for security, health, justice, logistics, and industry. Nanotechnologies, in particular soft materials and biomaterials, offer new possibilities of overt and covert layers for combating fraud and related corruption. Lasing, interferential reflection, light modulation, and photonic effects can be easily combined to give an amazing amount of possible solutions.

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“…Its photonic stop band can also be tuned by UV-irradiation using the change of the anisometry of the chiral-photochromic dopant [18]. In spite of the progress in development of dye-doped CLC lasers [3][4][5][6][7], the limitations inherent in the use of laser dyes in such compact tunable lasers are the inability of dyes to fluoresce at wavelengths of practical importance in the near-infrared, and the possibility of dye photobleaching and degradation.…”

Section: Quantum Dot Fluorescence In Glassy Cholestericmentioning

confidence: 99%

“…One of the vibrant areas in ultrathin tunable laser development is the utilization of photonic bandgap properties of planar-aligned cholesteric (chiral nematic) liquid crystal (CLC) structures doped with dyes to create tunable compact lasers [1][2][3][4][5][6][7][8][9][10] for applications ranging from miniature medical diagnostic tools to large-area holographic laser displays [4]. Recently, liquid crystals (LC) doped with single emitters were used in polarized single-photon sources for secure quantum communication applications [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Quantum Dot Fluorescence in Photonic Bandgap Glassy Cholesteric Liquid Crystal Structures: Microcavity Resonance under CW-Excitation, Antibunching and Decay Time

Lukishova

Winkler

Bissell

2014

Molecular Crystals and Liquid Crystals

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Nanocrystal quantum dot (NQD) fluorescence in 1-D glassy cholesteric liquid crystal host is investigated: (1) Microcavity resonance is obtained under cw-excitation demonstrating coupling between NQD fluorescence and a cholesteric microcavity. Observedat a band edge of a photonic stopband, this resonance has circular polarization due to microcavity chirality with 4.9 times intensity enhancement in comparison with polarization of the opposite handedness. (2) Photon antibunching of a single NQD in a similar microcavity was observed. (3) Fluorescence decay time constants were measured at different excitation powers. These results are important in developing cholesteric lasers and single-photon sources for secure quantum communication.

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Different Approaches of Employing Cholesteric Liquid Crystals in Dye Lasers

Abstract: ABSTRACT

Cited by 19 publications

References 57 publications

Lasing Characteristics of Dye-Doped Cholesteric Liquid Crystal

Lasing Characteristics of Dye-Doped Cholesteric Liquid Crystal

Anti-counterfeiting and identification solutions using soft matter

Quantum Dot Fluorescence in Photonic Bandgap Glassy Cholesteric Liquid Crystal Structures: Microcavity Resonance under CW-Excitation, Antibunching and Decay Time

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